I'm going to theorize that the StuG III and Panzer IV Ausf. H were originally going to be stock units. Pre-release screenshots show large amounts of Panzer IV Ausf. H's (named J in game), despite them appearing only in one underpowered doctrine as a late-game call-in. Also, when you call in a Sturmtiger, the voice-over sometimes calls it a StuG III, implying the StuG III was intended when they were recording audio.
I really wish they kept the old concepts, but Relic being Relic, they couldn't resist the allure of axis ubertanks
Ninja, argh, just get ingame, select 1v1 automatch, and play.
He has a point though, if you're going to flaunt authenticity and bill your faction as the "western German forces in 1944-1945", then you should
probably be authentic. Relic flaunts authenticity but OKW has little in common with the actual forces, OKW has no StuG's and no Panzer IV J's, the most authentic thing about the faction is the large number of Panthers used.